fat: Fix ATTR_RO for directory

[linux-2.6-omap-h63xx.git] / Documentation / ramdisk.txt

diff --git a/Documentation/ramdisk.txt b/Documentation/ramdisk.txt
index 7c25584e082c61919d4e51fde9fcc40d8e1f2bb8..6c820baa19a6edb3a4bc5127d884377ebcd36b60 100644 (file)
--- a/Documentation/ramdisk.txt
+++ b/Documentation/ramdisk.txt
@@ -6,7 +6,7 @@ Contents:
        1) Overview
        2) Kernel Command Line Parameters
        3) Using "rdev -r"
-       4) An Example of Creating a Compressed RAM Disk 
+       4) An Example of Creating a Compressed RAM Disk
 
 
 1) Overview
@@ -22,19 +22,17 @@ The RAM disk dynamically grows as more space is required. It does this by using
 RAM from the buffer cache. The driver marks the buffers it is using as dirty
 so that the VM subsystem does not try to reclaim them later.
 
-Also, the RAM disk supports up to 16 RAM disks out of the box, and can
-be reconfigured to support up to 255 RAM disks - change "#define NUM_RAMDISKS"
-in drivers/block/rd.c.  To use RAM disk support with your system, run
-'./MAKEDEV ram' from the /dev directory.  RAM disks are all major number 1, and
-start with minor number 0 for /dev/ram0, etc.  If used, modern kernels use
-/dev/ram0 for an initrd.
+The RAM disk supports up to 16 RAM disks by default, and can be reconfigured
+to support an unlimited number of RAM disks (at your own risk).  Just change
+the configuration symbol BLK_DEV_RAM_COUNT in the Block drivers config menu
+and (re)build the kernel.
 
-The old "ramdisk=<ram_size>" has been changed to "ramdisk_size=<ram_size>" to
-make it clearer.  The original "ramdisk=<ram_size>" has been kept around for
-compatibility reasons, but it may be removed in the future.
+To use RAM disk support with your system, run './MAKEDEV ram' from the /dev
+directory.  RAM disks are all major number 1, and start with minor number 0
+for /dev/ram0, etc.  If used, modern kernels use /dev/ram0 for an initrd.
 
 The new RAM disk also has the ability to load compressed RAM disk images,
-allowing one to squeeze more programs onto an average installation or 
+allowing one to squeeze more programs onto an average installation or
 rescue floppy disk.
 
 
@@ -51,7 +49,7 @@ default is 4096 (4 MB) (8192 (8 MB) on S390).
        ===================
 
 This parameter tells the RAM disk driver how many bytes to use per block.  The
-default is 512.
+default is 1024 (BLOCK_SIZE).
 
 
 3) Using "rdev -r"
@@ -70,7 +68,7 @@ These numbers are no magical secrets, as seen below:
 ./arch/i386/kernel/setup.c:#define RAMDISK_PROMPT_FLAG          0x8000
 ./arch/i386/kernel/setup.c:#define RAMDISK_LOAD_FLAG            0x4000
 
-Consider a typical two floppy disk setup, where you will have the 
+Consider a typical two floppy disk setup, where you will have the
 kernel on disk one, and have already put a RAM disk image onto disk #2.
 
 Hence you want to set bits 0 to 13 as 0, meaning that your RAM disk
@@ -97,12 +95,12 @@ Since the default start = 0 and the default prompt = 1, you could use:
        append = "load_ramdisk=1"
 
 
-4) An Example of Creating a Compressed RAM Disk 
+4) An Example of Creating a Compressed RAM Disk
 ----------------------------------------------
 
 To create a RAM disk image, you will need a spare block device to
 construct it on. This can be the RAM disk device itself, or an
-unused disk partition (such as an unmounted swap partition). For this 
+unused disk partition (such as an unmounted swap partition). For this
 example, we will use the RAM disk device, "/dev/ram0".
 
 Note: This technique should not be done on a machine with less than 8 MB